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The Eukaryotic Cell

Smooth ER is abundant in cells that manufacture large quantities of lipids (triglycerides, steroids, etc.). It is also abundant in liver cells geared toward detoxification. Smooth ER also plays a role in the metabolism of carbohydrates and calcium concentration, and attachment of receptors on cell membrane proteins. The smooth ER is connected to the nuclear envelope.

The Eukaryotic Cell

The Musculoskeletal System

Modified smooth ER, called the sarcoplasmic reticulum, plays a roll in triggering muscle contraction, releasing calcium ions in response to nerve impulses. The channels and enzymes present are different. While smooth ER is primarilly for biosynthesis, the sarcoplasmic reticulum is constructed for storing and pumping calcium ions.

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